Ore-roasting furnace



(No Model.) 2 Sheets-Sheet 1.

. E. GREEN.

ORE ROASTING FURNACE.

No. 323,666. Patented Aug 4, 1885.

Mv PETERS. Pmmum n w. Wahinpon. v.0

(No Model.) 2 Sheets-Sheet 2.

E. GREEN.

ORE ROASTING FURNACE. No. 323,666. Patented Aug, 4 1885.

UNITED STATES PArnN'r FFiCEt EDMUND GREEN, OF OAKLAND, CALIFORNIA.

OR E-ROASTING FURNACE.

SPECIFICATION forming part of Letters Patent No. 323,666, dated August 4, 1885.

(No model.)

To aZZ who??? it may concern:

Be itknown that I, EDMUND GREEN, of the city of Oakland, county of Alameda,and State of California, have invented an Improvement in Ore Roasting and Condensing Furnaces; and I hereby declare the following to be a full, clear, and exact description thereof.

My invention consists in the combination of the ore-chamber, the lower and upper fiues, the escape-pipe at the rear end of the chanis ber, the suction-blower in the pipe, the condenser with which the blower communicates, and the air-passage extending within the shell of the furnace, above the chamber, communicating with the open air at the rear of the furnace and with the ore-chamber at its forward end, all arranged as I shall hereinafter fully explain.

The object of my invention is to provide a furnace for treating the sul-phuret ores of gold, silver, cinuibar, and telluriurn, ores of gold, and others containing volatile matters, which is simple and cheap in construction and effective in operation.

Referring to the accompanying drawings, Figure 1 is a longitudinal vertical section of my furnace. Fig. 2 is a vertical cross-section of the same. 7

A is the furnace, having at one end the firedoor B, by which access is obtained to the firebox 0. This firebox is in direct communiontion with a fiue, D, which extends at an upward inclination to the rear end of the furnace, and there, by an upward bend, connects with a return-flue, F, extending to the front end of the furnace at a downward inclination and opening into the smoke-stack G. Between these two flues'is the ore-chamber H, to which access is bad by means of suitable doors, h, in the end and doors It in the sides. The chamher is separate and distinct from the fines, and neither the fumes nor the products of combustion enter the chamber.

Hoppers I,passing down through the top of the furnace at its upper or rear end, provide for supplying the charge to the ore-chamber.

Opening out of the upper end of the orechamber is a pipe or passage, J, communicating with the suction-blower K, which is in communication with a water-tank, L.

In the brick-work of the top of the furnace,

and about on its longitudinal center, is an air-passage, M, the upper or rear end of which is in communication with the outside air,

and the lower or forward end communicates through suitable pipes,m, with the forward end of the ore-charnber.

In the drawings herewith shown it will be seen that the lower and upper fire-fines and also the ore-chamber are divided into two parts longitudinally; but this construction is a mere matter of convenience, and is not essential to the operation of the furnace, which is as follows: The ore is fed through the hoppers I until the ore-chamber H is completely charged, the fire is started in the box 0, and its flames and products of combustion are drawn back through the lower flue, D, under the 0rechan1ber, and forward through the upper flue, F, over the chamber, to the front end of the furnace, and pass out through the smoke-stack G. In their course they nowhere come in contact with the charge of ore, which is, however, heated or roasted within its chamber, both below and above, and which is thus kept pure and prevented from vitrifying. The volatile portions or fumes are drawn off by the suction-blower K, through the pipe J ,and are forced down into the water-tank L,.whereby they are condensed and saved.

By not being mingled with the products of combustion these fumes are kept pure,and the condensed production consequently pure. Instead of admitting cold-air to the roastingchamber, as is usually done, it will be seen that the air in its course through the passage M is heated to a very high degree,and in that state is drawn into the lower or forward end of the chamber, whereby the ore is prevented from being chilled.

I do not confine myself to the water-tank here shown as a means for condensing the fumes, for any other suitable apparatus may be used, the object being not the means by which the fumes are condensed, but the fact of their condensation, by which they are saved without waste and in the purest state.

In working the charge in the chamber E that portion of the ore which is at the forward end, nearest the fire, is raked out first through the end doors, I, as it is completely roasted.

Then, by means of the usual hoes inserted through the side doors, h, the charge is raked m, the pipe J, communicating with the end of down and fresh material is added through the the ore-chamber, the suction-blower K, and hoppers. the condensing-tank L, with which the blower Having thus described my invention, what I communicates, all substantially as herein de 15 5 claim as new, and desire to secure by Letters scribed.

Patent, is In witness whereof I have hereunto set my The furnace A, having a fire-box, O, flues hand. D, and return-fines F, in combination with the EDMUND GREEN. ore-chambersH,air-passage M,communicating Witnesses: IO with the open air at the rear end and with the S. H. NoURsn, forward end of the ore-chambers through pipes H. 0. LEE. 

